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    <title>渐进增强，平稳退出【加入标记，创建结构】</title>
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<h1>What is the Document Object Model?</h1>
<p>The <abbr title="World Wide web Consortium.">W3C</abbr><acronym></acronym> defines the <abbr title="Document Object Model">DOM</abbr> as:</p>
<blockquote cite="http://www.w3c.org/DOM/">
<p>A platform- and language-neutral interface that will allow programs</p>
<p>and scripts to dynamically access and update the</p>
<p>content,structure and style of documents.</p>
<p>It is an API that can be used to navigate HTML and XML documents.</p>
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